Effects of Precondition Α2-Adrenoceptor Agents on Memory- and Anxiety-Related Processes in the Transient Cerebral Ischemic Rats Publisher Pubmed



Nasehi M¹ ; Imani E² ; Ebrahimighiri M³ ; Sabourikhanghah V² ; Zarrindast MR^{2, 4, 5, 6}
Source: Naunyn-Schmiedeberg's Archives of Pharmacology Published:2020

Abstract

Neurological evidence for the neuroprotective function of α2-adrenoceptors in the cerebral ischemia is inconsistent. It is not examined how pretreatment with a single dose of α2-adrenoceptor agents can affect motor function and anxiety- and memory-related responses in the cerebral ischemic animals. The transient forebrain ischemia model was provided, using a bilateral common carotid arterial occlusion (two-vessel occlusion, 2VO) in male Wistar rats. The 2VO rats impaired motor functions in the Rota-rod and wire grip tests and also decreased the step-through latency and the percentage of time spent on the open arms (%OAT), the percentage of entries into the open arms (%OAE) as well as locomotion in the elevated plus maze (EPM), indicating a memory deficit and anxiety-like behavior. Intraperitoneal single administration of yohimbine (0, 0.001, 0.01, and 0.1 mg/kg) before the 2VO did not alter these parameters while the higher and middle doses of clonidine (0.01 and 0.1 mg/kg) prevented the memory deficit and hypo-locomotion and its middle dose abrogated Rota-rod dysfunction and anxiety-like response. Meanwhile, both drugs did not influence on the measured behaviors in the sham groups by themselves. Moreover, yohimbine (0.001 mg/kg) abolished the beneficial effects of clonidine (0.01 and 0.1 mg/kg) on motor function in the Rota-rod and memory retention and also at its middle dose on the %OAT and locomotion in the 2VO rats. Our findings show a neuroprotective role for clonidine in motor function and memory- and anxiety-related behaviors of 2VO rats and the importance of α2-adrenoceptors in these processes. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.